Chemical industry production produces a large amount of waste salt to result in environmental pollution due to lack of proper treatment processes. Landfill is presently the main disposal method of waste salts in China, which is impossible to recycle the waste salt. This paper introduces two approaches to waste salt recycling and treatments in detail, that is, the high temperature pyrolysis+brine purification process and the resin adsorption+advanced oxidation process Several application cases are taken to analyze and find the reason for their low rates of waste salt resource utilization. It turns out that the treatment and reuse of waste salt lack related standards and regulations, on the other hand, economical and practical technology for massive application is still unavailable. Therefore some constructive suggestions are put forward, including the industrial waste salt discharge amount should be reduced to some extent to realize waste salt recycling, new method should be developed, and new laws should be published for utilization of waste salt.

In view of the treatment process of high salt and high concentration organic wastewater, through comparison and selection of various technologies, this article recommends the metal extraction method as the technology to realize metal recovery and resource reuse, the resin adsorption method as the technology to realize organic matter recovery and resource reuse, the advanced oxidation method as the technology to realize organic matter degradation, and the mechanical vapor recompression as the technology to realize salt recovery and separation. Furthermore, a set of technologies for resource treatment of high salt and high concentration organic wastewater is integrated, which takes "metal extraction resin adsorption advanced oxidation mechanical vapor recompression (MVR)" as the main process. This integrated technology is useful for fine chemical enterprises to realize cleaner production and bring considerable economic benefits; it is helpful to realize the high quality and high value recovery of organic matter and inorganic salt, and has very important social benefits; it may improve the wastewater treatment level and resource recycling efficiency of China's fine chemical industry, and produce significant environmental benefits. It can provide important technical guidance for the recycling technology and industrialization of high salt and high concentration organic wastewater in the production process of typical inorganic fine chemicals, and help the green and sustainable development of fine chemical industry.

Treatment of high-salt and high-concentration organic wastewater has become a bottleneck restricting green and sustainable development of the fine chemical industry. Aimed at the problems of wastewater treatment, such as large discharge, complex pollutant composition, high salt, high toxicity, poor biodegradability, difficult treatment and high cost, and difficulty in disposing of crystalline waste salt, this paper summarizes the harmless treatment technologies for high-salt and high-concentration organic wastewater, including the harmless treatment technology for organic matter, desalination technology, and related integrated technology, and predicts the development trend of the harmless treatment technology for high-salt and high-concentration organic wastewater in the fine chemical industry.

Aimed at the pollution characteristics of high salinity and high concentration organic wastewater in inorganic fine chemical industry such as complex composition and difficult degradation this study explorates and practises valuable components recovery and water resource reuse technology in the production process of nickel cobalt battery materials in inorganic fine chemical industry. The results show the followings:the oil removal rate from the wastewater can reach 99%; the anhydrous sodium sulfate obtained from resource recovery can meet the class III standard of GB/T 6009-2014 (Na₂SO₄ content >92%); the TOC content of wastewater after treatment is ≤ 0.05%, and the water reuse rate is more than 85%. When the evaporation residue is mixed with fly ash and other auxiliary materials, ceramsite can be prepared. So all of them can be recycled. The treatment cost per ton of water in the whole process is reduced from 220 yuan to less than 180 yuan, which has significant economic and environmental benefits.

A set of devices for wastewater evaporation have been built and a series of researches on evaporation of distilled ammonia wastewater and pigment production wastewater have been carried out to obtain the characteristics of the evaporation process so as to provide basic data for evaporation system design. The results show that the boiling point elevation of the wastewater increases gradually with the rise of concentration multiple, and that the boiling points of distilled ammonia wastewater and pigment production wastewater from different process stages are slightly different under the same concentration multiple. The COD in the condensate water of pigment production wastewater gradually decreases in the evaporation process. Change rules of TDS and pH in the condensate water of different kinds of wastewater are roughly the same, i.e., to decrease firstly then tend to be constant, mainly being dependent upon the volatile substances and droplet inclusion in the wastewater.

Treatment of dye wastewater in fine chemical industry has become a bottleneck restricting the sustainable development of this industry. In this paper, aimed at the characteristics of dye wastewater, e.g. complex pollutant composition, plenty of poisonous and harmful ingredients and poor biodegradability, the commonly used harmless treatment technologies are reviewed, including physical treatment methods, chemical treatment methods, biological treatment methods and combination processes of the above. On this basis, the development trend of harmless treatment technology of dye wastewater is predicted to provide technical guidance for treatment of dye wastewater and promote the green and sustainable development of fine chemical industry.

The study on adsorption performance and mechanism of aniline on coal granular activated carbon is important technical support for removing a large number of aniline pollutants in dye wastewater. Through adsorption experiments of aniline on coal based granular activated carbons with different concentrations, carbon dosages/COD, adsorption times and pH values, and the adsorption isotherm and adsorption kinetics curves it is shown that the removal rate of aniline and the unit adsorption capacity of aniline are 17.28 mg/g and 98.8%, respectively when the single control variable is carbon dosage/COD of 4.5, under the premise of other conditions being unchanged. When pH value is 5, the aniline removal efficiency is the best. Aniline removal rate and unit adsorption capacity are 16.17 mg/g and 92.47%, respectively. Similarly, when other variables remain unchanged, the higher the concentration, the higher the unit adsorption capacity, but the lower the removal rate; the longer the adsorption time, the higher the adsorption capacity and removal rate. The fitting degree of Langmuir isotherm equation is 0.9929, indicating that a monomolecular layer of aniline is adsorbed on the surface of coal granular activated carbon. The Freundlich characteristic constant 1/n is 0.3363, indicating that this adsorption process is easy to occur. In addition, the adsorption process is more in line with the quasi-second-order kinetics, and the adsorption rate is controlled by internal diffusion and internal surface adsorption process. This study provides reference for improving operating efficiency and reducing treatment cost of activated carbon adsorption process.

Sources, output and water quality characteristics of pesticide wastewater in China are summarized. Through the investigation and analysis of the recycling treatment technology of pesticide wastewater, it is clear that the current recycling treatment technology of pesticide wastewater is facing some difficult problems, such as lack of standard support and policy guidance, lack of effective targeted treatment technology, low utilization rate of resources, high cost of treatment, immature technology and equipment, and shortage of resource integration technology with a wide range of application. By further analyzing the effect of various integrated treatment technologies on pesticide wastewater treatment, it is determined that integrated treatment technology can not only improve the efficiency of pesticide wastewater resource treatment but also make up for the defects of single method, thus enhancing the feasibility and reducing the cost. Integrated technology has become the research trend of pesticide wastewater resource treatment.